15. The power of prayer lies in the thought and does not depend on words, the place or the moment in which it is proffered. Therefore it is possible to pray in all places, at any time, alone or with others. The influence of a place or time is only felt according to the circumstances which favour the meditation. Communal prayer has a more powerful action when all who are praying join together in a heartfelt thought and envisage the same objective, since it is as if many beseeched together in one voice. But it will do no good for a large number of people to gather together for prayer if each one acts in isolation, on their own account. A hundred people can pray selfishly, whereas two or three joined by the same aspirations, praying like true brothers and sisters in Christ, will give more power to their prayer than would the hundred selfish persons (See chapter 28, items 4 & 5).